Delivery Site is not rendering and getting Blank Page

Hi All,

We haven't make any changes on the portal from the past 2 months, suddenly we are getting blank pages only on Live sites. and getting below errors in Portal & Tomcat Logs.

Kindly please help to resolve this issue.

PORTAL ERROR:

2016-06-25 23:01:44,113 [ajp-bio-9009-exec-5] ERROR com.vignette.ext.templating.portal.taglib.VAPIncludeTag com.vignette.ext.templating.portal.taglib.VAPIncludeTag - Error in performing the cross-context include to /sites with path /in_line/theme.jsp
java.lang.IllegalStateException: Cannot forward after response has been committed
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:349)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
    at com.vignette.ext.furl.servlet.FriendlyURLFilter.doFilter(FriendlyURLFilter.java:106)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
    at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:605)
    at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:544)
    at com.vignette.ext.templating.portal.taglib.VAPIncludeTag.doStartTag(VAPIncludeTag.java:180)
    at org.apache.jsp.templates.template0005.VZVRdRQefaUVdfbVcUcabYRQWRbVTTaQ.qu_005fgrid_jsp._jspService(qu_005fgrid_jsp.java:177)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at 

...

2016-06-25 23:01:44,224 [ajp-bio-9009-exec-5] ERROR com.vignette.ext.templating.portal.taglib.VAPIncludeTag com.vignette.ext.templating.portal.taglib.VAPIncludeTag - Error in performing the cross-context include to /sites with path /in_line/contentRegion.jsp
java.lang.IllegalStateException: Cannot forward after response has been committed
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:349)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
    at com.vignette.ext.furl.servlet.FriendlyURLFilter.doFilter(FriendlyURLFilter.java:106)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
    at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:605)
    at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:544)
    at com.vignette.ext.templating.portal.taglib.VAPIncludeTag.doStartTag(VAPIncludeTag.java:180)
    at org.apache.jsp.templates.template0008.fTTdUdQVQWXTVZQWXdRcYeXTWRbVTTaQ.qu_005fheader_jsp._jspx_meth_page_005finclude_002dpage_005f0(qu_005fheader_jsp.java:173)
    at org.apache.jsp.templates.template0008.fTTdUdQVQWXTVZQWXdRcYeXTWRbVTTaQ.qu_005fheader_jsp._jspService(qu_005fheader_jsp.java:143)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at

TOMCAT ERROR:

Jun 26, 2016 9:14:12 AM org.apache.catalina.loader.WebappClassLoader checkThreadLocalMapForLeaks
SEVERE: The web application [/sites] created a ThreadLocal with key of type [com.vignette.as.server.persist.ObjectTypeCache$ThreadLocalCache$1] (value [com.vignette.as.server.persist.ObjectTypeCache$ThreadLocalCache$1@154c04de]) and a value of type [java.util.HashMap] (value [{29f8c16755589f00VgnVCM1000002d01130a____=com.vignette.as.client.javabean.ContentType@6f4fba3d, 2119c16755589f00VgnVCM1000002d01130a____=com.vignette.as.client.javabean.ContentType@5b4c33e2, ASLOCALE0000000000000000000000000000TYPE=com.vignette.as.client.javabean.ObjectType@67e26941, CONTENTTYPE0000000000000000000000000TYPE=com.vignette.as.client.javabean.ObjectType@416c5faf, 9c08593ef57d8f00VgnVCMServer5701130a____=com.vignette.as.client.javabean.ContentType@31fdfbb7, SITE00000000000000000000000000000000TYPE=com.vignette.as.client.javabean.ObjectType@1998c505, CHANNEL00000000000000000000000000000TYPE=com.vignette.as.client.javabean.ObjectType@7caed863}]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.

Jun 26, 2016 9:14:12 AM org.apache.catalina.loader.WebappClassLoader checkThreadLocalMapForLeaks
SEVERE: The web application [/portal] created a ThreadLocal with key of type [com.epicentric.threadpool.standard.PoolableThreadLocal$1] (value [com.epicentric.threadpool.standard.PoolableThreadLocal$1@286c7a2d]) and a value of type [java.util.HashMap] (value [{}]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
Jun 26, 2016 9:14:12 AM org.apache.catalina.loader.WebappClassLoader checkThreadLocalMapForLeaks
SEVERE: The web application [/portal] created a ThreadLocal with key of type [com.epicentric.threadpool.standard.PoolableThreadLocal$1] (value [com.epicentric.threadpool.standard.PoolableThreadLocal$1@286c7a2d]) and a value of type [java.util.HashMap] (value [{L:�O�A>/��I���=com.epicentric.portalbeans.portlet.PortletPortalPageContextImpl@69c93516}]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
Jun 26, 2016 9:14:12 AM org.apache.catalina.loader.WebappClassLoader checkThreadLocalMapForLeaks
SEVERE: The web application [/portal] created a ThreadLocal with key of type [com.epicentric.threadpool.standard.PoolableThreadLocal$1] (value [com.epicentric.threadpool.standard.PoolableThreadLocal$1@286c7a2d]) and a value of type [java.util.HashMap] (value [{}]) but failed to remove it when the web application was stopped. Threads are going to be renewed over time to try and avoid a probable memory leak.
Jun 26, 2016 9:14:12 AM org.apache.catalina.loader.WebappClassLoader checkThreadLocalMapForLeaks
SEVERE: The web application [/portal] created a ThreadLocal with key of type [com.epicentric.threadpool.standard.PoolableThreadLocal$1] (value